[jboss-user] [Messaging, JMS & JBossMQ] - ConcurrentModificationException

[maisen]

Hello, 
I want to test the performance of the jboss-jms-service. Therefore I create a number of POJOs (every one in an own thread) in a client application. This POJOs are calling stateless session beans in the JBoss-Server to generate jms-messages an sending the messages to queues. After that MDB's getting and adding some comments to the messages and pushing the message-objects to queues, where they will be received from the waiting stateless session beans and get them back to the client objects for analysing the time they needed.

When I create about 80 - 100 threads on the clientside for calling the stateless session beans method getAvailability (by remote interface and RMI/JRMP) I get allways the following exception. I tried this with the same effects by JBoss 4.0.1 and 4.0.4.

If my results are interesting for the community I would appreciate to publish them in that forum. 
Thanks for any help!
maisen

java.util.ConcurrentModificationException
	at java.util.HashMap$HashIterator.nextEntry(HashMap.java:782)
	at java.util.HashMap$KeyIterator.next(HashMap.java:818)
	at java.util.HashSet.writeObject(HashSet.java:252)
	at sun.reflect.GeneratedMethodAccessor92.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:324)
	at java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:809)
	at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1296)
	at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1247)
	at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1052)
	at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1332)
	at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1304)
	at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1247)
	at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1052)
	at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:278)
	at java.rmi.MarshalledObject.(MarshalledObject.java:92)
	at org.jboss.invocation.jrmp.server.JRMPInvoker.invoke(JRMPInvoker.java:424)
	at sun.reflect.GeneratedMethodAccessor82.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:324)
	at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:261)
	at sun.rmi.transport.Transport$1.run(Transport.java:148)
	at java.security.AccessController.doPrivileged(Native Method)
	at sun.rmi.transport.Transport.serviceCall(Transport.java:144)
	at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:460)
	at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:701)
	at java.lang.Thread.run(Thread.java:534)
	at sun.rmi.transport.StreamRemoteCall.exceptionReceivedFromServer(StreamRemoteCall.java:247)
	at sun.rmi.transport.StreamRemoteCall.executeCall(StreamRemoteCall.java:223)
	at sun.rmi.server.UnicastRef.invoke(UnicastRef.java:133)
	at org.jboss.invocation.jrmp.server.JRMPInvoker_Stub.invoke(Unknown Source)
	at org.jboss.invocation.jrmp.interfaces.JRMPInvokerProxy.invoke(JRMPInvokerProxy.java:118)
	at org.jboss.invocation.InvokerInterceptor.invokeInvoker(InvokerInterceptor.java:163)
	at org.jboss.invocation.InvokerInterceptor.invoke(InvokerInterceptor.java:103)
	at org.jboss.proxy.TransactionInterceptor.invoke(TransactionInterceptor.java:46)
	at org.jboss.proxy.SecurityInterceptor.invoke(SecurityInterceptor.java:55)
	at org.jboss.proxy.ejb.StatelessSessionInterceptor.invoke(StatelessSessionInterceptor.java:97)
	at org.jboss.proxy.ClientContainer.invoke(ClientContainer.java:91)
	at $Proxy1.doAvailabilityRequest(Unknown Source)
	at de.isogmbh.client.RequestClient.getAvailability(RequestClient.java:153)
	at de.isogmbh.client.RequestClient.callEJB(RequestClient.java:111)
	at de.isogmbh.client.RequestClient.run(RequestClient.java:89)

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